All Octicons
file-directory-fill
Octicon sizes navigation
React
import {FileDirectoryFillIcon} from '@primer/octicons-react' <FileDirectoryFillIcon size={16} />
Rails
<%= render(Primer::Beta::Octicon.new(:"file-directory-fill", size: :small)) %>
Jekyll
{% octicon file-directory-fill height:16 %}
Figma
This icon is called file-directory-fill
in Primer's Octicons library.